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Here's my two cents. Been shooting photos for over 15 years. First thing is to know whether you have enough light to focus correctly at a shoot. If you're indoors sometimes the camera cannot focus correctly because of the light level in the room is too dark. Second is if you're using a lens that has a zoom on it. Light levels can drastically change. And cause this problem. You don't have the problem with your phone because it's a fixed lens. Which maybe that is what you need a lens that does not zoom that has a fixed length. But let me boil this down to an easier way. No professional photographer really goes running around trying to figure out how much beer is in the photos. We just get one good lens that we like and we just keep using the hell out of it. Because you can't go back and redo a photo after the model has left the studio. Experiment with some lenses. And when you find the one that works for you. Then that's it that's the one lens for that type and style a photo. But I have had problems with Canon cameras. And other high end camera not focusing the way I want them to. In fact I actually enjoyed my Sony 6000. What a great night fast focusing and sharp images that camera gives me. Hope this helps.
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